The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_kern.c

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    1 /*-
    2  * Copyright (c) 2002 Poul-Henning Kamp
    3  * Copyright (c) 2002 Networks Associates Technology, Inc.
    4  * All rights reserved.
    5  *
    6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
    7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
    8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
    9  * DARPA CHATS research program.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. The names of the authors may not be used to endorse or promote
   20  *    products derived from this software without specific prior written
   21  *    permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD$");
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/kernel.h>
   42 #include <sys/eventhandler.h>
   43 #include <sys/malloc.h>
   44 #include <sys/bio.h>
   45 #include <sys/sysctl.h>
   46 #include <sys/proc.h>
   47 #include <sys/kthread.h>
   48 #include <sys/lock.h>
   49 #include <sys/mutex.h>
   50 #include <sys/sx.h>
   51 #include <sys/sbuf.h>
   52 #include <geom/geom.h>
   53 #include <geom/geom_int.h>
   54 
   55 MALLOC_DEFINE(M_GEOM, "GEOM", "Geom data structures");
   56 
   57 struct sx topology_lock;
   58 
   59 static struct proc *g_up_proc;
   60 
   61 int g_debugflags;
   62 int g_collectstats = 1;
   63 int g_shutdown;
   64 
   65 /*
   66  * G_UP and G_DOWN are the two threads which push I/O through the
   67  * stack.
   68  *
   69  * Things are procesed in a FIFO order, but these threads could be
   70  * part of I/O prioritization by deciding which bios/bioqs to service
   71  * in what order.
   72  *
   73  * We have only one thread in each direction, it is belived that until
   74  * a very non-trivial workload in the UP/DOWN path this will be enough,
   75  * but more than one can actually be run without problems.
   76  *
   77  * Holding the "mymutex" is a debugging feature:  It prevents people
   78  * from sleeping in the UP/DOWN I/O path by mistake or design (doing
   79  * so almost invariably result in deadlocks since it stalls all I/O
   80  * processing in the given direction.
   81  */
   82 
   83 static void
   84 g_up_procbody(void)
   85 {
   86         struct proc *p = g_up_proc;
   87         struct thread *tp = FIRST_THREAD_IN_PROC(p);
   88 
   89         mtx_assert(&Giant, MA_NOTOWNED);
   90         tp->td_base_pri = PRIBIO;
   91         for(;;) {
   92                 g_io_schedule_up(tp);
   93         }
   94 }
   95 
   96 struct kproc_desc g_up_kp = {
   97         "g_up",
   98         g_up_procbody,
   99         &g_up_proc,
  100 };
  101 
  102 static struct proc *g_down_proc;
  103 
  104 static void
  105 g_down_procbody(void)
  106 {
  107         struct proc *p = g_down_proc;
  108         struct thread *tp = FIRST_THREAD_IN_PROC(p);
  109 
  110         mtx_assert(&Giant, MA_NOTOWNED);
  111         tp->td_base_pri = PRIBIO;
  112         for(;;) {
  113                 g_io_schedule_down(tp);
  114         }
  115 }
  116 
  117 struct kproc_desc g_down_kp = {
  118         "g_down",
  119         g_down_procbody,
  120         &g_down_proc,
  121 };
  122 
  123 static struct proc *g_event_proc;
  124 
  125 static void
  126 g_event_procbody(void)
  127 {
  128         struct proc *p = g_event_proc;
  129         struct thread *tp = FIRST_THREAD_IN_PROC(p);
  130 
  131         mtx_assert(&Giant, MA_NOTOWNED);
  132         tp->td_base_pri = PRIBIO;
  133         for(;;) {
  134                 g_run_events();
  135                 tsleep(&g_wait_event, PRIBIO, "-", hz/10);
  136         }
  137 }
  138 
  139 static struct kproc_desc g_event_kp = {
  140         "g_event",
  141         g_event_procbody,
  142         &g_event_proc,
  143 };
  144 
  145 static void
  146 geom_shutdown(void *foo __unused)
  147 {
  148 
  149         g_shutdown = 1;
  150 }
  151 
  152 void
  153 g_init(void)
  154 {
  155 
  156         g_trace(G_T_TOPOLOGY, "g_ignition");
  157         sx_init(&topology_lock, "GEOM topology");
  158         g_io_init();
  159         g_event_init();
  160         g_ctl_init();
  161         mtx_lock(&Giant);
  162         kproc_start(&g_event_kp);
  163         kproc_start(&g_up_kp);
  164         kproc_start(&g_down_kp);
  165         mtx_unlock(&Giant);
  166         EVENTHANDLER_REGISTER(shutdown_pre_sync, geom_shutdown, NULL,
  167                 SHUTDOWN_PRI_FIRST);
  168 }
  169 
  170 static int
  171 sysctl_kern_geom_conftxt(SYSCTL_HANDLER_ARGS)
  172 {
  173         int error;
  174         struct sbuf *sb;
  175 
  176         sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
  177         g_waitfor_event(g_conftxt, sb, M_WAITOK, NULL);
  178         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  179         sbuf_delete(sb);
  180         return error;
  181 }
  182  
  183 static int
  184 sysctl_kern_geom_confdot(SYSCTL_HANDLER_ARGS)
  185 {
  186         int error;
  187         struct sbuf *sb;
  188 
  189         sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
  190         g_waitfor_event(g_confdot, sb, M_WAITOK, NULL);
  191         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  192         sbuf_delete(sb);
  193         return error;
  194 }
  195  
  196 static int
  197 sysctl_kern_geom_confxml(SYSCTL_HANDLER_ARGS)
  198 {
  199         int error;
  200         struct sbuf *sb;
  201 
  202         sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
  203         g_waitfor_event(g_confxml, sb, M_WAITOK, NULL);
  204         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  205         sbuf_delete(sb);
  206         return error;
  207 }
  208 
  209 SYSCTL_NODE(_kern, OID_AUTO, geom, CTLFLAG_RW, 0, "GEOMetry management");
  210 
  211 SYSCTL_PROC(_kern_geom, OID_AUTO, confxml, CTLTYPE_STRING|CTLFLAG_RD,
  212         0, 0, sysctl_kern_geom_confxml, "",
  213         "Dump the GEOM config in XML");
  214 
  215 SYSCTL_PROC(_kern_geom, OID_AUTO, confdot, CTLTYPE_STRING|CTLFLAG_RD,
  216         0, 0, sysctl_kern_geom_confdot, "",
  217         "Dump the GEOM config in dot");
  218 
  219 SYSCTL_PROC(_kern_geom, OID_AUTO, conftxt, CTLTYPE_STRING|CTLFLAG_RD,
  220         0, 0, sysctl_kern_geom_conftxt, "",
  221         "Dump the GEOM config in txt");
  222 
  223 TUNABLE_INT("kern.geom.debugflags", &g_debugflags);
  224 SYSCTL_INT(_kern_geom, OID_AUTO, debugflags, CTLFLAG_RW,
  225         &g_debugflags, 0, "");
  226 
  227 SYSCTL_INT(_kern_geom, OID_AUTO, collectstats, CTLFLAG_RW,
  228         &g_collectstats, 0, "");
  229 
  230 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_class, CTLFLAG_RD,
  231         0, sizeof(struct g_class), "");
  232 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_geom, CTLFLAG_RD,
  233         0, sizeof(struct g_geom), "");
  234 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_provider, CTLFLAG_RD,
  235         0, sizeof(struct g_provider), "");
  236 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_consumer, CTLFLAG_RD,
  237         0, sizeof(struct g_consumer), "");
  238 SYSCTL_INT(_debug_sizeof, OID_AUTO, g_bioq, CTLFLAG_RD,
  239         0, sizeof(struct g_bioq), "");

Cache object: fe429ef8594a7c6b1d035bf7a242dd0f


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